UNIT 41. His employers could not complain about his work because he was ______ in the performance of his duties. A. derelict B. penetrating C. diversified D. assiduous.employer 雇主，老板employee 雇员assiduous 勤奋的insidious 阴险的，狡诈的derelict 遗弃物relics 遗骨relict 残余物penetrate 穿透permeate 渗透diffuse 弥漫diversify 使不同